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The evolution of exuberant visible polymorphisms

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JournalEvolution: international journal of organic evolution
DateE-pub ahead of print - 10 Jun 2009
DatePublished (current) - Oct 2009
Issue number10
Volume63
Number of pages10
Pages (from-to)2697-2706
Early online date10/06/09
Original languageEnglish

Abstract

Visible genetic polymorphism is a common feature of many species. In most cases, the mechanism(s) underlying the maintenance of such variation remain obscure although apostatic selection has often been suggested. Here, we explore individual-based evolutionary models to understand what features of predator-prey relationships may lead to patterns of exuberant polymorphism similar to those observed in the wild. When all morphs are equally visible, the number of evolved morphs increases with the strength of apostatic selection although even with powerful selection the number morphs is still relatively small. The introduction of dietary wariness increases the number of morphs substantially, even when apostatic selection is absent. When one morph is more cryptic the number of evolved morphs is fewer. The cryptic morph reaches high frequency in the population and other morphs are each at lower frequencies. Decreasing the predation intensity enhances the number of evolved morphs in all models. Dietary wariness is a critical factor missing from earlier models and it may provide a general solution to the problem of polymorphisms involving many morphs. Apostatic selection is shown to be neither a necessary, nor a sufficient, requirement for the maintenance of exuberant polymorphisms.

    Research areas

  • Dietary conservatism, massive polymorphism, neophobia, search image, spiders, Theridion californicum, Theridion grallator, THERIDION-GRALLATOR ARANEAE, HAPPY-FACE SPIDER, FREQUENCY-DEPENDENT PREDATION, COLOR POLYMORPHISM, APOSTATIC SELECTION, HETEROGENEOUS ENVIRONMENTS, DIETARY CONSERVATISM, GENETIC-POLYMORPHISM, VIRTUAL PREY, MASSIVE POLYMORPHISM

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